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(No Model.) 2 Sheets-Sheet 1. 1

O.N.SGOTT PUMPING ENGINE.

No. 592,513. Patented Oct 26, 1-897.

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W ITNESSESI INVENTOR.

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(No Model.)

C N SCOT S-Sheet 2 PUMPiNG ENGINE. 592,513. Patented Oct. 26,1897.

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ATTORNEYS- UNITED STATES PATENT OFFICE.

CLARENCE N. SCOTT, OF BUFFALO, NElV YORK, ASS IGNOR TO THE SNO\V STEAM PUMP IVORKS OF BUFFALO, OF SAME PLACE.

PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 592,513, dated October 26, 1897.

Application filed January 12, 1897. Serial No. 618,948. N model- To all whom, it nmy concern: arranged in a casing F, provided with two Be it known that I, CLARENCE N. SCOTT, a valve-seatsff, which open into a dischargesubject of the Queen of Great Britain, residing pipe g, leading to the suction-pipe d or openat Buffalo, in the county of Erie and State of ing at some other convenient point.

New York, have invented new and useful Im- I'I represents an actuating-cylinder containprovementsin Pumping-Engines,of which the ing a piston 71, which is connected by a rod h following is a specification. with the by-pass valve.

The object of this invention, is to provide I represents a spring which bears against a pumpingengine with means whereby the the piston h in the cylinder II and holds the 10 stopping of the engine is prevented when the valve closed. The tension of this spring can discharge of the pumped water or other liqbe adjusted bya screw 2', arranged in the outer uid from the delivery stops temporarily. In head 2," of the cylinder. The cyliner H is pumping-engines which are used in connecpreferably supported by an open frame II, tion with elevators it happens at times that no which is cast with the cylinder and the stuff- I 5 water is used and that consequently no water in g-box of the valve'oasing. is discharged from the delivery-pipe of the J represents a pipe whereby the actuating pump, in which case the engine stops or befluid is supplied to the inner end of the cylcomes stallec In order to prevent this, I inder, and j is a cock which is arranged in said provide the delivery-pipe of the pump with pipe and which controls the flow of the liquid 20 an auxiliary escape or by-pass which is conto the actuating-cylinder. The cylinder is trolled by a speed-govenorin such away that provided at its inner end with a drain-openwhen the speed of the engine has fallen to ing it, through which the actuating fluid esthe lowest permissible or desirable point the capes from the cylinder. lhis opening is by-pass is opened, allowing a sufficient espreferably made so small in area, as com- 2 5 cape of the pumped liquid to permit the enpared with the area of the supply-pipe, that gine to maintain this low speed, while when no escape-valve is required. As actuating the normal discharge of the pumped liquid fluid I prefer to use the liquid in the deliveryis resumed and the speed rises again the bypipe, and for that purpose the supply-pipe J pass is closed. is connected with the delivery-pipe, as shown.

30 In the accompanyingdrawings, consisting L represents a centrifugal or speed govof two sheets, Figure l is a side elevation of ernor which may be actuated from the enapumping-engine provided with myimprovegine-shaft by a belt Z and pulleys Z Z as ments. Fig. 2 is a sectional elevation, 011 an shown. This governor is connected by a leenlarged scale, of the by-pass valve and its ver 1% and rod n with the arm on the plug of 35 automatic actuating mechanism. Fig. 3 isa the supply-cock j in such manner that the top plan view of the same. supply-cock remains closed so long as the Like letters of reference refer to like parts speed of the engine is greater than the lowest in the several figures. permissible or desirable speed, but is opened A represents the steam-cylinder, B the when the speed drops to the lowest speed at 40 pump-cylinder, and O the fly-wheel shaft, of which the engine will maintain its motion. 0 a pumping-engine which may be of any suit- The lever on may be provided with a counterable construction and arrangement. balance m.

D represents the delivery-pipe, and d the So long as the engine runsat a speed which suction-pipe. is higher than the lowest permissible or de- 45 e represents an auxiliary escape opening or sirable speed the governor keeps the supply- 5 by-pass formed in the delivery at a convencock j closed and the spring holds the byient point, and E represents the valve, which pass valve closed, in which position of the closes this bypass in the normal operation of valve its actuating-piston stands at the inner the pump. As shown in the drawings, this end of the cylinder. IVhen the speed of the 50 valve maybe adouble-beat or balanced valve engine drops to the lowest permissible or desirable point, the governor opens the supplyoock and the actuating fluid enters theinner end of the cylinder and forces the piston back againstthe pressure of the spring, thereby opening the by-pass valve, which latter permits of a sufficient escape of liquid from the delivery to maintain this low speed of the engine. As soon as the speed of the engine increases by the escape of liquid from the delivery in the usual Way the governor closes the supply-cock, shutting off the actuating fluid from the piston. The spring-pressure now forces the piston back, as the fluid escapes from the cylinder through the small escapeopening until the by-pass valve is closed.

I claim as my invention 1. In a pumping-engine, the combination with the delivery havingaby-pass and a valve controlling said by-pass, of a cylinder and piston whereby said valve is actuated, and a speed-governor whereby the admission of the actuating fluid to said cylinder and piston is controlled in such manner that said valve is opened when the speed falls to a certain point and closed when the speed rises above such point, substantially as set forth.

2. In a pumping-engine, the combination with the delivery having a bypass, of a valve controlling said by-pass, a valve-actuating piston and cylinder, a spring tending to seat said valve, and a speed-governor whereby the supply of the actuating fluid to said cylinder is controlled, substantially as set forth.

3. In a pumping-engine, the combination with the delivery havinga by-pass, of-a valve controlling said by-pass, an actuating-piston connected with said valve, a cylinder in which said piston is arranged, a spring bearing against said piston and tending to seat said valve, a conduit for actuating fluid opening into the cylinder and provided With a cock, and a speed-governor connected with said cock, substantially as set forth.

Witness my hand this 9th day of January, 1897.

CLARENCE N. SCOTT.

Witnesses:

JNo. J. BONNER, EDWARD WILHELM. 

